P generation Хуwт Ҳуwт F, generation F, generation contalns wild-type females and yellow-bodied, white-eyed, minlature-winged males. Xytw*mt xywm F2 generation Females Males Total Gray body, red eyes, long wings Gray body, red eyes, miniature wings Gray body, white eyes, long wings Gray body, white eyes, minlature wings Yellow body, red eyes, long wings Yellow body, red eyes, miniature wings Yellow body, white eyes, long wings Yellow body, white eyes, miniature wings 439 319 758 208 193 401 11 16 12 178 139 317 365 335 700 Morgan's three-factor crosses involving three x-linked traits in Drosophila. Genes+Traits Three genes that govern body color, eye color, and wing length are all found on the x chromosome of fruit flies. Therefore, the offspring tend to inherit a nonrecombinant pattern of alleles (y+w+m+ or ywm). Figure 6.5 explains how single and double crossovers can create a recombinant pattern of alleles.

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In Morgan’s three-factor crosses of Figure shown, he realized that
crossing over was more frequent between the eye color and wing
length genes than between the body color and eye color genes.
Explain how he determined this.

P generation
Хуwт Ҳуwт
F, generation
F, generation
contalns wild-type
females and
yellow-bodied,
white-eyed,
minlature-winged
males.
Xytw*mt xywm
F2 generation
Females
Males
Total
Gray body, red eyes, long wings
Gray body, red eyes, miniature wings
Gray body, white eyes, long wings
Gray body, white eyes, minlature wings
Yellow body, red eyes, long wings
Yellow body, red eyes, miniature wings
Yellow body, white eyes, long wings
Yellow body, white eyes, miniature wings
439
319
758
208
193
401
11
16
12
178
139
317
365
335
700
Morgan's three-factor crosses involving three x-linked traits in Drosophila.
Genes+Traits Three genes that govern body color, eye color, and wing length
are all found on the x chromosome of fruit flies. Therefore, the offspring tend to
inherit a nonrecombinant pattern of alleles (y+w+m+ or ywm). Figure 6.5 explains
how single and double crossovers can create a recombinant pattern of alleles.
Transcribed Image Text:P generation Хуwт Ҳуwт F, generation F, generation contalns wild-type females and yellow-bodied, white-eyed, minlature-winged males. Xytw*mt xywm F2 generation Females Males Total Gray body, red eyes, long wings Gray body, red eyes, miniature wings Gray body, white eyes, long wings Gray body, white eyes, minlature wings Yellow body, red eyes, long wings Yellow body, red eyes, miniature wings Yellow body, white eyes, long wings Yellow body, white eyes, miniature wings 439 319 758 208 193 401 11 16 12 178 139 317 365 335 700 Morgan's three-factor crosses involving three x-linked traits in Drosophila. Genes+Traits Three genes that govern body color, eye color, and wing length are all found on the x chromosome of fruit flies. Therefore, the offspring tend to inherit a nonrecombinant pattern of alleles (y+w+m+ or ywm). Figure 6.5 explains how single and double crossovers can create a recombinant pattern of alleles.
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